BU's acceptance depth approach, I consider it to be a terrible approach to bigger blocks.

Usually 6 confirms is considered as statistically set in stone. Not with BU, all of a sudden a bigger block might fall through the gate causing a chain reorganisation and potentially the transaction might not have any confirmations at all due to the mining policy on the new longer chain.

It's overcomplicated approach introduces new economic risks, even if its bugs are fixed.

I am all for bigger blocks. However you can call BU Bitcoin Unavailable, Bitcoin Uncredible, Bitcoin Unneeded or the Bitcoin Undead for all I care.